<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        * {
            margin: 0;
            padding: 0;
        }

        ul {
            list-style: none;
        }

        .wrapper {
            width: 1000px;
            height: 475px;
            margin: 0 auto;
            margin-top: 100px;
        }

        .tab {
            border: 1px solid #ddd;
            border-bottom: 0;
            height: 36px;
            width: 320px;
        }

        .tab li {
            position: relative;
            float: left;
            width: 80px;
            height: 34px;
            line-height: 34px;
            text-align: center;
            cursor: pointer;
            border-top: 4px solid #fff;
        }

        .tab span {
            position: absolute;
            right: 0;
            top: 10px;
            background: #ddd;
            width: 1px;
            height: 14px;
            overflow: hidden;
        }

        .products {
            width: 1002px;
            border: 1px solid #ddd;
            height: 476px;
        }

        .products .main {
            float: left;
            display: none;
        }

        .products .main.selected {
            display: block;
        }

        .tab li.active {
            border-color: red;
            border-bottom: 0;
        }

    </style>
    <script src="jQuery.js"></script>
    <script>
        jQuery(window).ready(function () {
            //需求:鼠标放到那个li上，让该li添加active类，下面的对应的.main的div添加selected
            $(".tab>li").mouseenter(function () {
                //不用判断，当前的li添加active类，其他的删除active类
                $(this).addClass("active").siblings("li").removeClass("active");
                //对应索引值的div添加selected类，其他的删除selected类
                //【重要】根据tab的索引值获取下方图片div的索引值
                $(".products>div").eq($(this).index()).addClass("selected").siblings("div").removeClass("selected");
            });
        });
    </script>
</head>
<body>
<div class="wrapper">
    <ul class="tab">
        <li class="tab-item active">国际大牌<span>◆</span></li>
        <li class="tab-item">国妆名牌<span>◆</span></li>
        <li class="tab-item">清洁用品<span>◆</span></li>
        <li class="tab-item">男士精品</li>
    </ul>
    <div class="products">
        <div class="main selected">
            <a href="###"><img src="js_ex\banner\april-5.jpg" alt=""/></a>
        </div>
        <div class="main">
            <a href="###"><img src="js_ex\banner\april-6.jpg" alt=""/></a>
        </div>
        <div class="main">
            <a href="###"><img src="js_ex/banner/april-7.jpg" alt=""/></a>
        </div>
        <div class="main">
            <a href="###"><img src="js_ex/banner/april-8.jpg" alt=""/></a>
        </div>
    </div>
</div>

</body>
</html>
